//C10:10.18:vararr2d.c
#include <stdio.h>
#define ROWS  3
#define COLS  4

int sum2d(int rows, int cols, int ar[rows][cols]);
int main(void)
{
	int i, j;
	int rs = 3;
	int cs = 10;
	int junk[ROWS][COLS] = 
	{
		{2, 4, 6, 8},
		{3, 5, 7, 9},
		{12, 10, 8, 6}
	};

	int morejunk[ROWS - 1][COLS + 2] = 
	{
		{20, 30, 40, 50, 60, 70},
		{5, 6, 7, 8, 9, 10}
	};
	
	int varr[rs][cs];

	for (i = 0; i < rs; i++)
	{
		for (j = 0; j < cs; j++)
		{
			varr[i][j] = i * j + j;
		}
	}

	printf("3 x 5 array\n");
	printf("Sum of al elments = %d\n",
			sum2d(ROWS, COLS, junk));

	printf("2 x 6 array\n");
	printf("Sum of all elements = %d\n",
			sum2d(ROWS - 1, COLS + 2, morejunk));

	printf("3 x 10 VLA\n");
	printf("Sum of all elements = %d\n",
			sum2d(rs, cs, varr));
}

int sum2d(int rows, int cols, int ar[rows][cols])
{
	int r;
	int c;
	int tot = 0;

	for (r = 0; r < rows; r++)
	{
		for (c = 0; c < cols; c++)
		{
			tot += ar[r][c];
		}
	}

	return tot;
}
